Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents
The dynamic adsorption characteristics of K<sub>2</sub>CO<sub>3</sub>-promoted layered double hydroxides (LDHs)-based adsorbent, with organic and inorganic anion intercalation, were studied. MgAl–LDH, K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH, and K<sub&...
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| Format: | Article |
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MDPI AG
2024-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/29/6/1192 |
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| author | Ruotong Li Xixuan Hu Liang Huang Nicholas Mulei Musyoka Tianshan Xue Qiang Wang |
| author_facet | Ruotong Li Xixuan Hu Liang Huang Nicholas Mulei Musyoka Tianshan Xue Qiang Wang |
| author_sort | Ruotong Li |
| collection | DOAJ |
| description | The dynamic adsorption characteristics of K<sub>2</sub>CO<sub>3</sub>-promoted layered double hydroxides (LDHs)-based adsorbent, with organic and inorganic anion intercalation, were studied. MgAl–LDH, K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH, and K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH(C16) with varying K<sub>2</sub>CO<sub>3</sub> loads were prepared and used for intermediate-temperature CO<sub>2</sub> sequestration. The adsorbent was thoroughly characterized using X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, and Fourier Transform Infrared Spectroscopy techniques, which revealed enhanced adsorption properties of MgAl–LDH, due to K<sub>2</sub>CO<sub>3</sub> promotion. Thermogravimetric CO<sub>2</sub> adsorption tests on the constructed adsorbent materials showed that the 12.5 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH(C16) adsorbent with organic anion intercalation exhibited optimal adsorption activity, achieving an adsorption capacity of 1.12 mmol/g at 100% CO<sub>2</sub> and 350 °C. However, fixed-bed dynamic adsorption tests yielded different results; the 25 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH prepared through inorganic anion intercalation exhibited the best adsorption performance in low-concentration CO<sub>2</sub> penetration tests. The recorded penetration time was 93.1 s, accompanied by an adsorption capacity of 0.722 mmol/g. This can be attributed to the faster adsorption kinetics exhibited by the 25 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH adsorbent during the early stages of adsorption, thereby facilitating efficient CO<sub>2</sub> capture in low-concentration CO<sub>2</sub> streams. This is a conclusion that differs from previous reports. Earlier reports indicated that LDHs with organic anion intercalation exhibited higher CO<sub>2</sub> adsorption activity in thermogravimetric analyzer tests. However, this study found that for the fixed-bed dynamic adsorption process, K<sub>2</sub>CO<sub>3</sub>-modified inorganic anion-intercalated LDHs perform better, indicating their greater potential in practical applications. |
| first_indexed | 2024-04-24T17:58:22Z |
| format | Article |
| id | doaj.art-75fa084ffb28411990ad71c1f926dd12 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-04-24T17:58:22Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-75fa084ffb28411990ad71c1f926dd122024-03-27T13:56:42ZengMDPI AGMolecules1420-30492024-03-01296119210.3390/molecules29061192Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived AdsorbentsRuotong Li0Xixuan Hu1Liang Huang2Nicholas Mulei Musyoka3Tianshan Xue4Qiang Wang5Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, ChinaEngineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, ChinaEngineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, ChinaNottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo 315100, ChinaInstitute of Atmospheric Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaEngineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, ChinaThe dynamic adsorption characteristics of K<sub>2</sub>CO<sub>3</sub>-promoted layered double hydroxides (LDHs)-based adsorbent, with organic and inorganic anion intercalation, were studied. MgAl–LDH, K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH, and K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH(C16) with varying K<sub>2</sub>CO<sub>3</sub> loads were prepared and used for intermediate-temperature CO<sub>2</sub> sequestration. The adsorbent was thoroughly characterized using X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, and Fourier Transform Infrared Spectroscopy techniques, which revealed enhanced adsorption properties of MgAl–LDH, due to K<sub>2</sub>CO<sub>3</sub> promotion. Thermogravimetric CO<sub>2</sub> adsorption tests on the constructed adsorbent materials showed that the 12.5 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH(C16) adsorbent with organic anion intercalation exhibited optimal adsorption activity, achieving an adsorption capacity of 1.12 mmol/g at 100% CO<sub>2</sub> and 350 °C. However, fixed-bed dynamic adsorption tests yielded different results; the 25 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH prepared through inorganic anion intercalation exhibited the best adsorption performance in low-concentration CO<sub>2</sub> penetration tests. The recorded penetration time was 93.1 s, accompanied by an adsorption capacity of 0.722 mmol/g. This can be attributed to the faster adsorption kinetics exhibited by the 25 wt% K<sub>2</sub>CO<sub>3</sub>/MgAl–LDH adsorbent during the early stages of adsorption, thereby facilitating efficient CO<sub>2</sub> capture in low-concentration CO<sub>2</sub> streams. This is a conclusion that differs from previous reports. Earlier reports indicated that LDHs with organic anion intercalation exhibited higher CO<sub>2</sub> adsorption activity in thermogravimetric analyzer tests. However, this study found that for the fixed-bed dynamic adsorption process, K<sub>2</sub>CO<sub>3</sub>-modified inorganic anion-intercalated LDHs perform better, indicating their greater potential in practical applications.https://www.mdpi.com/1420-3049/29/6/1192K<sub>2</sub>CO<sub>3</sub>-promoted LDHsorganic anion intercalationinorganic anion intercalationCO<sub>2</sub> dynamic adsorptionadsorption capacityintermediate-temperature |
| spellingShingle | Ruotong Li Xixuan Hu Liang Huang Nicholas Mulei Musyoka Tianshan Xue Qiang Wang Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents Molecules K<sub>2</sub>CO<sub>3</sub>-promoted LDHs organic anion intercalation inorganic anion intercalation CO<sub>2</sub> dynamic adsorption adsorption capacity intermediate-temperature |
| title | Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents |
| title_full | Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents |
| title_fullStr | Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents |
| title_full_unstemmed | Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents |
| title_short | Dynamic Intermediate-Temperature CO<sub>2</sub> Adsorption Performance of K<sub>2</sub>CO<sub>3</sub>-Promoted Layered Double Hydroxide-Derived Adsorbents |
| title_sort | dynamic intermediate temperature co sub 2 sub adsorption performance of k sub 2 sub co sub 3 sub promoted layered double hydroxide derived adsorbents |
| topic | K<sub>2</sub>CO<sub>3</sub>-promoted LDHs organic anion intercalation inorganic anion intercalation CO<sub>2</sub> dynamic adsorption adsorption capacity intermediate-temperature |
| url | https://www.mdpi.com/1420-3049/29/6/1192 |
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